linux-kernel - [PATCH 1/2] x86: Make save_stack_address() !CONFIG_FRAME

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Date:	Tue,  8 Jun 2010 22:13:42 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 1/2] x86: Make save_stack_address() !CONFIG_FRAME_POINTER friendly

From: Oleg Nesterov <oleg@...hat.com>

If CONFIG_FRAME_POINTER=n, print_context_stack() shouldn't neglect the
non-reliable addresses on stack, this is all we have if dump_trace(bp)
is called with the wrong or zero bp.

For example, /proc/pid/stack doesn't work if CONFIG_FRAME_POINTER=n.

This patch obviously has no effect if CONFIG_FRAME_POINTER=y, otherwise
it reverts 1650743c "x86: don't save unreliable stack trace entries".

Also, remove the unnecessary type-cast.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Cc: Roland McGrath <roland@...hat.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Vegard Nossum <vegard.nossum@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>
LKML-Reference: <20100603193239.GA31530@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/stacktrace.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index ea54d02..abc321d 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -26,8 +26,10 @@ static int save_stack_stack(void *data, char *name)
 static void save_stack_address(void *data, unsigned long addr, int reliable)
 {
 	struct stack_trace *trace = data;
+#ifdef CONFIG_FRAME_POINTER
 	if (!reliable)
 		return;
+#endif
 	if (trace->skip > 0) {
 		trace->skip--;
 		return;
@@ -39,9 +41,11 @@ static void save_stack_address(void *data, unsigned long addr, int reliable)
 static void
 save_stack_address_nosched(void *data, unsigned long addr, int reliable)
 {
-	struct stack_trace *trace = (struct stack_trace *)data;
+	struct stack_trace *trace = data;
+#ifdef CONFIG_FRAME_POINTER
 	if (!reliable)
 		return;
+#endif
 	if (in_sched_functions(addr))
 		return;
 	if (trace->skip > 0) {
-- 
1.6.2.3

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